Siddhattha let go of all outside disturbances, and memories of pleasures from the past. He let go of all worldly thoughts and turned his mind to find the ultimate truth about life. He asked himself: "What is the origin of suffering? How can one be free from suffering?" At first many distracting images appeared in his mind. But finally his mind became very calm, like a pond of still water. In the calm of samadhi (meditation), Siddhattha searched for the origin of his own life. At last, he gained the three highest Insight-knowledges.